KR101123173B1 - Ceramic honeycomb filter and method for production thereof - Google Patents

Abstract

A ceramic honeycomb fired body having a porous partition partitioning a flow path and a sealing portion formed in a predetermined flow path, and a ceramic honeycomb filter for removing particulates from exhaust gas passing through the porous partition wall, wherein the ceramic honeycomb fired body is a cordier A ceramic honeycomb filter comprising a ceramic material composed mainly of light, wherein at least a part of the seal portion contains ceramic particles and an amorphous oxide matrix, and the amorphous oxide matrix is formed of a colloidal oxide.

Ceramic honeycomb fired body, ceramic honeycomb filter, sealant, cordierite, ceramic particles, amorphous oxide matrix.

Description

Ceramic honeycomb filter and its manufacturing method {CERAMIC HONEYCOMB FILTER AND METHOD FOR PRODUCTION THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic honeycomb filter for removing particulates from exhaust gas of a diesel engine, a method for manufacturing the same, and a sealing material for producing such a ceramic honeycomb filter.

In order to remove particulates from the exhaust gas of a diesel engine, a ceramic honeycomb filter for particulate collection, i.e., a structure in which a partition of a ceramic honeycomb fired body is made of a porous structure and the exhaust gas containing particulates is passed through the partition. DPF (Diesel Particular Filter) has been developed and put into practice. The ceramic honeycomb filter includes a ceramic honeycomb fired body having a porous partition wall and an outer circumferential wall forming a flow path, and sealing sections alternately sealing both end surfaces of the flow path. Since the ceramic honeycomb filter is exposed to high temperature in use, a heat-resistant cordierite ceramic having a small thermal expansion coefficient is used for the ceramic honeycomb fired body, and the sealing material is the same as the honeycomb structure in order to reduce the thermal expansion difference with the ceramic honeycomb fired body. Cordierite ceramics are used.

When the exhaust gas containing microparticles | fine-particles flows into such a ceramic honeycomb filter, the microparticles | fine-particles in exhaust gas will be collected by the pore of a porous partition. If the collected fine particles accumulate excessively in the ceramic honeycomb filter, there is a fear that the pressure loss of the filter is increased and that the output of the engine is lowered. Therefore, by using external ignition means such as an electric heater or a burner, the collected fine particles are burned periodically to regenerate the ceramic honeycomb filter. In general, a pair of ceramic honeycomb filters is mounted in an automobile, and an alternate regeneration method using the other filter during regeneration of one filter is adopted.

As for the characteristics of the ceramic honeycomb filter, it is required to suppress the pressure loss in order not to deteriorate the engine performance, and to have heat shock resistance to withstand thermal shocks caused by rapid temperature changes such as when the engine is regenerated or stopped. As for the sealing portion of the ceramic honeycomb filter, the following improved structures have been proposed so far.

Japanese Patent Application No. 63-28875 is a method for sealing the open end of a ceramic honeycomb fired body, and the fired honeycomb structure is sealed by a cordierite raw material batch, and then fired at a temperature of 1300 ° C. or higher. A method of cordiering a cordierite raw material batch is disclosed. According to this method, the predetermined opening end of the flow path of the ceramic honeycomb fired body can be completely sealed, and a cordierite-like honeycomb filter having excellent heat shock resistance and high reliability can be obtained.

Japanese Laid-Open Patent Publication No. 2002-136817 discloses a predetermined opening end of a flow path of a firing agent or an unbaked ceramic honeycomb fired body with a sealing material composed of a fired powder and an unfired powder having the same composition as that of a ceramic honeycomb fired body. Disclosed is a ceramic honeycomb filter formed by heating at a high temperature to form a seal. In this ceramic honeycomb filter, since the sealing material contains pulverized powder having the same composition as the ceramic honeycomb fired body, no cracks due to thermal expansion difference occur in the sealing portion or the honeycomb structure in the vicinity thereof even at a high temperature, and the sealing portion is peeled off. The problem does not occur.

However, when the sealing material is heated to a cordierite temperature (for example, 1300 ° C.) or more and adhered to the ceramic honeycomb fired body as in the conventional art, it is difficult to match the thermal expansion coefficient of the cordierite ceramic honeycomb structure and the seal portion. . That is, in extrusion molding of cordierite clay which is a raw material of the ceramic honeycomb fired body, since the plate-shaped kaolin particles in the raw material are oriented when passing through the narrow slit of the extrusion die, the cordierite crystals produced by firing are also oriented. The coefficient of thermal expansion in the flow path direction and the radial direction of the honeycomb structural body obtained is small. However, since the sealing material does not pass through the narrow slit of the extrusion die, the orientation of the cordierite crystals becomes random, and the coefficient of thermal expansion is relatively large. Therefore, the difference of the thermal expansion coefficient of a honeycomb structure and a sealing part becomes large.

Moreover, at the fixing temperature of 1300 degreeC or more, big residual stress generate | occur | produces in the interface between a sealing part and ceramic honeycomb fired bodies. Due to such a large residual stress, when mounted on an automobile, cracks occur at the interface between the seal or the seal and the honeycomb structure due to heat shock from the exhaust gas, mechanical shock from engine vibration or road vibration, or the seal is dropped. Can be.

Japanese Patent Application Laid-Open No. 63-24731 discloses a method of drilling a predetermined portion of a film adhered to an open end of a porous ceramic honeycomb structure, and sealing a predetermined passage by introducing a sealing material into the passage from the hole. In Example 3 of this document, the slurry containing the pulverized product of alumina cement and mullite was introduced into a predetermined flow path of the ceramic honeycomb structure under vibration, and the resulting seal was about 2 hours at a temperature of 55 DEG C and a humidity of 90%. The honeycomb structure and the sealing portion are integrated together. In this method, since the fixing temperature of a sealing part is low at 55 degreeC, residual stress in the interface between a sealing part and a ceramic honeycomb structure is small.

However, since the coefficient of thermal expansion of the cordierite honeycomb structure is small, and the coefficient of thermal expansion of the sealing portion made of mullite and alumina cement is relatively large, when the vehicle is mounted on an automobile, there is a crack between the ceramic honeycomb structure and the sealing portion due to thermal shock by exhaust gas. This may occur or the seal may peel off and fall off.

Problems to be Solved by the Invention

Accordingly, an object of the present invention is to provide a ceramic honeycomb filter having a small difference in thermal expansion coefficient between the partition wall and the sealing portion of the ceramic honeycomb fired body, a low residual stress due to a low fixing temperature of the sealing portion, and excellent thermal shock resistance. .

Another object of the present invention is to provide a method for producing such a ceramic honeycomb filter.

Still another object of the present invention is to provide a sealing material for use in producing such a ceramic honeycomb filter.

Means to solve the problem

The inventors of the present invention form the ceramic honeycomb fired body with a material containing cordierite as a main component, and form the sealing portion with a sealing material containing ceramic particles and colloidal oxide, and the colloidal oxide is amorphous even when heated at a low temperature. The present inventors have found that a ceramic honeycomb filter having a small residual stress can be obtained because the difference in thermal expansion coefficient between the ceramic honeycomb fired body and the seal is small and the seal is fixed at low temperature.

That is, the ceramic honeycomb filter of the present invention has a ceramic honeycomb fired body having a porous partition partitioning a flow path and a sealing portion formed in a predetermined flow path, and removes fine particles from exhaust gas passing through the porous partition wall. The honeycomb fired body is made of a ceramic material mainly containing cordierite, at least a part of the sealing portion contains ceramic particles and an amorphous oxide matrix, and the amorphous oxide matrix is formed of a colloidal oxide.

The ceramic particles are preferably cordierite particles and / or amorphous silica particles. In addition, the ceramic particles are preferably made of a pulverized powder of the same material as the ceramic honeycomb fired body. The colloidal oxide is preferably colloidal silica and / or colloidal alumina.

In the method of manufacturing the ceramic honeycomb filter of the present invention, the ceramic honeycomb fired body is formed of a ceramic material containing cordierite as a main component, and the sealing material filled in a predetermined flow path of the ceramic honeycomb fired body is 100 ° C. or lower. Heating at a temperature of to form a sealing portion fixed to the ceramic honeycomb fired body.

It is preferable that it is 500 degrees C or less, and, as for the fixing temperature of the said sealing material, it is more preferable that it is 150 degrees C or less.

At least some of the seals are preferably formed of a sealant containing ceramic particles and colloidal oxide.

The sealing material for ceramic honeycomb filters of the present invention is characterized by containing ceramic particles and a colloidal oxide.

Effects of the Invention

(a) Since the sealing portion contains ceramic particles, the difference in thermal expansion coefficient between the sealing portion and the ceramic honeycomb fired body is small, and (b) the sealing portion contains an amorphous oxide matrix formed of a colloidal oxide. The temperature at which the ceramic honeycomb fired body is fixed is low, and the residual stress of the ceramic honeycomb fired body is small. Therefore, the ceramic honeycomb filter of the present invention has excellent heat shock resistance, and the manufacturing cost is greatly reduced.

Best Mode for Carrying Out the Invention

The ceramic honeycomb filter of the present invention comprises a ceramic honeycomb fired body made of a ceramic material mainly containing cordierite, and a seal formed in a predetermined flow path of the ceramic honeycomb fired body, and at least some of the seals are ceramic particles. And a sealing material containing a colloidal oxide. By filling the sealing material in a predetermined flow path of the ceramic honeycomb fired body and heating it, the colloidal oxide becomes an amorphous oxide matrix to firmly fix the seal between the sealing portion and the ceramic honeycomb fired body. First, the sealing material which forms a sealing part is demonstrated, Then, a ceramic honeycomb filter and its manufacturing method are demonstrated.

[1] sealants

The ceramic particles in the sealing material for ceramic honeycomb filters of the present invention are preferably cordierite particles and / or amorphous silica particles. Since the thermal expansion coefficients of the cordierite particles and the amorphous silica particles are small, the thermal expansion coefficient of the sealing portion can be made small, and the difference in the thermal expansion coefficient between the sealing portion and the cordierite ceramic honeycomb fired body can be made small. In the sealing part containing such a ceramic particle, the residual stress which arises by sticking with the partition of a honeycomb structure is small. In addition to cordierite particles and / or amorphous silica particles, mullite ceramics may be blended. It is preferable that the largest particle diameter of a ceramic particle is 200 micrometers or less, It is more preferable that it is 100 micrometers or less, It is preferable that the average particle diameter is 5-50 micrometers, It is more preferable that it is 5-15 micrometers.

It is preferable that especially the ceramic particle which comprises a sealing part consists of pulverized powder of the same material as a ceramic honeycomb baking body. Since the difference in coefficient of thermal expansion between the sealing portion and the cordierite ceramic honeycomb fired body is small, it is possible to avoid the problem of cracking or dropping of the sealing portion or the interface between the sealing portion and the honeycomb structure. have. At this time, the ceramic particles need not be made only of a pulverized powder having the same material as that of the ceramic honeycomb fired body, and cordierite particles, amorphous silica particles, mullite ceramic particles, or the like may be mixed.

It is preferable that the colloidal oxide which forms the amorphous oxide matrix of a sealing part has colloidal silica and / or colloidal alumina as a main component. This can adjust suitably the viscosity of the sealing material which consists of (a) colloidal silica and / or colloidal alumina, can reliably fill a sealing material to each part of a flow path, and improves the adhesive force between a partition and a sealing part. This is because it is possible to increase the thickness and at the same time, excellent sealing property with (b) the ceramic particles, so that a high strength sealing portion can be formed.

It is preferable that a colloidal oxide is 1-50 mass parts in conversion of solid content with respect to 100 mass parts of ceramic particles. If the colloidal oxide is less than 1 part by mass in terms of solid content, the force of the amorphous oxide matrix formed from the colloidal oxide to bond with the ceramic particles is insufficient, so that the sealing portion may be dropped. On the other hand, when the colloidal oxide exceeds 50 parts by mass in terms of solid content, the coefficient of thermal expansion of the sealing portion becomes large, and the thermal shock resistance of the ceramic honeycomb filter to which the sealing portion is fixed may deteriorate. The blending ratio of the solid content conversion of the colloidal oxide is more preferably 2 to 35 parts by mass, and most preferably 5 to 20 parts by mass with respect to 100 parts by mass of the ceramic particles.

The ceramic honeycomb filter sealing material of the present invention may contain ceramic fibers, cement or the like, in addition to the ceramic particles and the colloidal oxide. Moreover, you may contain organic binders, such as methyl cellulose, a dispersing agent, etc. in order to adjust the viscosity of a sealing material and to improve workability.

[2] honeycomb ceramic filters

1 is a perspective view showing an example of the appearance of a ceramic honeycomb filter to which the present invention can be applied, and FIG. 2 is a cross-sectional view when the ceramic honeycomb filter of FIG. 1 is used as an exhaust gas purification filter. As shown in FIG. 1 and FIG. 2, the ceramic honeycomb filter 1 to which the present invention can be applied includes a ceramic honeycomb fired body 11 having an outer circumferential wall 11a and a porous partition 11b therein; It consists of sealing parts 12a and 12b which alternately seal the open ends of both the flow paths 11c surrounded by the porous partition 11b. The ceramic honeycomb filter 1 is housed in a metal storage container 14, and the outer circumferential wall 11a is fixed by the grip members 13a and 13b.

The proportion of the amorphous oxide matrix in the sealing portions 12a and 12b is substantially the same as that of the colloidal oxide in the sealing material. That is, with respect to 100 mass parts of ceramic particles, 1-50 mass parts is preferable, as for content of an amorphous oxide matrix, 2-35 mass parts is more preferable, and 5-20 mass parts is the most preferable.

The exhaust gas 10a containing fine particles flows into the flow passage 11c at the open end on the inflow side, passes through the porous partition 11b, and then is purified at the open end on the outflow side through the adjacent flow path 11c. It is discharged as gas 10b. When passing through the porous partition 11b, the fine particles contained in the exhaust gas 10a are collected in the pores of the porous partition 11b, so that the ceramic honeycomb filter 1 functions as an exhaust gas purification filter.

The ceramic honeycomb filter of the present invention can be used not only for alternating regeneration but also for continuous regeneration for continuously burning fine particles by combination with a noble metal catalyst.

[3] manufacturing methods for ceramic honeycomb filters

In the method for producing a ceramic honeycomb filter of the present invention, a predetermined flow path of a ceramic honeycomb fired body made of a ceramic material containing cordierite as a main component is filled with a sealing material containing ceramic particles and colloidal oxide, and has a temperature of 100 ° C. or lower. It is characterized by heating at a temperature.

In the present invention, by the presence of the colloidal oxide, the fixing temperature of the sealing material can be lowered to 100 ° C. or lower, and it is not necessary to bake at a cordierite temperature of 1300 ° C. or higher as in the prior art. Therefore, residual stress caused by adhesion of the ceramic honeycomb fired body and the sealing portion can be reduced. By suppressing the residual stress small, cracks are generated at the sealing portion or at the interface between the sealing portion and the honeycomb structure due to thermal shock caused by exhaust gas or mechanical shock from engine vibration or road surface vibration when the vehicle is mounted on an automobile. It is possible to avoid the problem of the sealing part falling off. In addition, since the fixing temperature is 100 ° C. or lower, the heating energy cost can be reduced.

When the colloidal oxide in the sealant is dehydrated at a temperature of 100 ° C. or lower, an irreversibly hard solid amorphous oxide matrix can be obtained, which firmly bonds the ceramic particles to the partition wall of the ceramic honeycomb fired body. Stick firmly. Since the sealing portion contains an amorphous oxide matrix formed of ceramic particles and colloidal oxide, the thermal expansion coefficient of the sealing portion is small, and the difference in thermal expansion coefficient with the cordierite ceramic honeycomb fired body having a low thermal expansion coefficient is small. Therefore, the residual stress of the ceramic honeycomb filter of the present invention is small.

The fixing temperature of the partition and the sealing portion can be 100 ° C. or lower because the aqueous colloid of the colloidal oxide in the sealing material can be sufficiently dehydrated at 100 ° C. or lower to obtain an irreversibly hard solid, that is, an amorphous oxide matrix. . Therefore, the ceramic particles are firmly bonded at a temperature of 100 ° C. or lower, and firmly bonded to the partition walls of the ceramic honeycomb fired body, whereby the partition walls and the sealing portion are fixed integrally. Although the temperature which fixes a partition and a sealing material should just be more than the dehydration temperature of a colloidal oxide, the upper limit may generally be 100 degreeC, and especially 500 degreeC and 150 degreeC may be sufficient as it. In particular, when the fixing temperature of the sealing portion is 500 ° C. or lower, the residual stress caused by the difference in thermal expansion coefficient between the honeycomb structure and the sealing portion can be reduced, and the energy cost due to the fixing can be reduced. And it is preferable that the minimum of the fixing temperature of a sealing part is 50 degreeC.

Using the sealing material for the ceramic honeycomb filter of the present invention, the sealing material is filled in each of the opening ends of the predetermined flow paths of the two ceramic honeycomb fired bodies, and then the sealing materials of both ceramic honeycomb fired bodies are brought into contact with each other to bring a temperature of 100 ° C. or lower. By heating at, it is possible to obtain a ceramic honeycomb filter in which both ceramic honeycomb fired bodies are integrally fixed in the direction of the flow path through the sealing portion. In this case, the sealing part is formed only in the downstream opening end of the upstream ceramic honeycomb fired body, whereby a ceramic honeycomb filter having an upstream space of the inflow side sealing part can be obtained. In the ceramic honeycomb filter having such a structure, the fine particles in the exhaust gas are effectively collected in the space upstream of the sealing portion on the inflow side. The filter can be regenerated by burning the collected fine particles by an external ignition means provided on the inflow side of the filter. Also in this case, the sealing portion and the partition walls of both ceramic honeycomb fired bodies are firmly fixed to each other and can withstand thermal shocks due to rapid temperature changes.

Although the present invention will be described in more detail with reference to the following examples, the present invention is not limited thereto.

1 is a perspective view showing the appearance of the ceramic honeycomb filter of the present invention.

2 is a schematic cross-sectional view showing the structure of the ceramic honeycomb filter of the present invention.

3A is a schematic cross-sectional view showing a method of forming a seal in a predetermined flow path of a ceramic honeycomb filter.

3B is a schematic cross-sectional view showing a method of forming a seal in a predetermined flow path of the ceramic honeycomb filter.

Examples 1 to 27, Comparative Examples 1 to 3, Conventional Example 1

(1) Manufacture of Ceramic Honeycomb Plastic Body

A cordierite raw material was kneaded and the molded object of a honeycomb structure was obtained by the extrusion molding method. This molded body was baked at a temperature of 1425 ° C to obtain a cordierite ceramic honeycomb fired body having an outer diameter of 266.7 mm and a total length of 304.8 mm.

(2) Preparation of sealing material slurry

The ceramic particles and colloidal oxides shown in Table 1 were mixed at the compounding ratios shown for Examples 1 to 27 in Table 2, and 1.2 parts by mass of methyl cellulose and water were added as organic binders to 100 parts by mass of ceramic particles, and the ceramic honeycomb was The sealing material slurry of Examples 1-27 which can seal a fired body was obtained. As the ceramic particles, fused silica A in Examples 1 to 9, fused silica B in Examples 10 to 12, and cordierite powder (pulverized powder of cordierite honeycomb structure having a porosity of 65%) in Examples 13 to 27, respectively Used. In Examples 1 to 25, colloidal silica was used as colloidal oxide, and colloidal alumina was used in Examples 26 and 27.

To the sealing materials of Comparative Examples 1 to 3 shown in Table 3, 1.2 parts by mass of methyl cellulose and water were added and kneaded as organic binders, thereby obtaining a sealing material slurry of Comparative Examples 1 to 3 capable of sealing the ceramic honeycomb fired body. In Comparative Examples 1 and 2, the cordierite powder (pulverized powder of the cordierite honeycomb structure having a porosity of 65%) and cordierite unbaked raw material powder (talc 15% by mass, calcined) were calcined. Consisting of talc 24%, kaolin 20%, calcined kaolin 26.5%, and alumina 14.5%). In Comparative Example 3, only cordierite unbaked raw material powder was used.

Cordierite unfired raw material batch No. 1 (calculated talc 38.2%, kaolin 20.0%, calcined kaolin 21.8%, alumina 10.5%, and aluminum hydroxide 9.5%) described in the examples of Japanese Patent Application No. 63-28875 1 mass part of methyl cellulose, 9.25 mass parts of glycerin, and 30 mass parts of water were added and knead | mixed with respect to 100 mass parts of raw material powders, and the sealing material slurry of the prior art example 1 which can seal a ceramic honeycomb fired body was obtained.

(3) sealing method

As shown in FIG. 3, the resin mask 21 with an opening part was prepared in order to seal the predetermined | prescribed flow path of a ceramic honeycomb fired body. In order to form the opening part in the mask 21, the machining, heating, punching method, etc. were used.

As shown in Fig. 3 (a), the opening end of the flow path 11c on one end side of the honeycomb structure 11 is closed in the container 20 in a state where only a predetermined opening end is blocked by the resin mask 21 made of resin. It was immersed in each sealing material slurry 12c contained. At the opening end of the honeycomb structure 11, moisture was absorbed into the partition wall from the slurry penetrating into the flow path, and a sealing portion was formed. As shown in FIG.3 (b), the honeycomb structure 11 was pulled up from the sealing material slurry 12c, and the sealing part 12a was dried. The same process of dipping was performed also on the open end of the other end of the ceramic honeycomb fired body 11, and the honeycomb structure in which the flow path was sealed alternately was obtained.

In order to fix a sealing part to the partition 11b of the ceramic honeycomb fired body 11, the sealing part of each honeycomb structure was heated at the temperature shown in Tables 2 and 3. The depth of the sealing part of the obtained ceramic honeycomb filter was all set to 10 mm in consideration of the influence on a thermal shock resistance.

(4) evaluation

About each obtained ceramic honeycomb filter, the thermal shock resistance and the strength of the sealing part were evaluated.

(a) thermal shock resistance

Each ceramic honeycomb filter was heated from room temperature to a set temperature in an electric furnace, held at the set temperature for 2 hours, and then taken out of the electric furnace to observe the presence of cracks. The evaluation criteria of heat shock resistance are as follows.

If no crack occurred above 600 ℃: Right

If no crack occurred above 550 ° C and below 600 ° C: Positive

If cracks did not occur above 500 ° C and below 550 ° C:

If cracks occur below 500 ° C: Poor

If no crack occurs (right to a) at 500 ° C or higher, it is a pass, and a crack is generated at a temperature below 500 ° C. The evaluation results of the heat shock resistance are shown in Tables 2 and 3.

(b) strength of seal

Each sealing part was pressurized with the spherical indenter whose tip was 1.0 mm in diameter, and the breaking strength of each sealing part was measured. The relative value of the strength of each sealing material at the time of making the strength of the sealing part of the prior art example 1.0 is shown in Tables 2 and 3.

As shown in Tables 2 and 3, it can be seen that the ceramic honeycomb filters of Examples 1 to 27 are very excellent in the thermal shock resistance and the strength of the sealing portion, as compared with the ceramic honeycomb filters of Comparative Examples 1 to 3 and Conventional Example 1. there was. In Comparative Example 2 and Conventional Example 1 in which the sealing portion was fixed at 1400 ° C., cracks occurred in the ceramic honeycomb filter below 500 ° C. On the other hand, in Example 1 and 13 whose fixing temperature of the sealing part is 1000 degreeC, the heat-resistant shock temperature was 500 degreeC or more and passed. Moreover, in Examples 2-12 and 14-27 whose fixing temperature of the sealing part is 150 degreeC-850 degreeC, the heat-resistant shock temperature was 500 degreeC or more. Particularly, the fixing temperature of the sealing portion was set to 500 ° C. or lower, the ground powder of the honeycomb filter fired body was used as ceramic particles, and the colloidal silica was used in a ratio of 5 to 20 parts by mass in terms of solid content as a colloidal oxide. , 19, 22, and 23, the thermal shock temperature of the ceramic honeycomb filter was very high, 600 ° C., and was excellent in thermal shock resistance.

Claims (9)

A ceramic honeycomb filter having a ceramic honeycomb fired body having a porous partition partitioning a flow path and sealing sections formed in a predetermined flow path, wherein the ceramic honeycomb filter removes fine particles from exhaust gas passing through the porous partition wall. The ceramic honeycomb fired body is made of a ceramic material containing cordierite as a main component, at least some of the seals contain ceramic particles and an amorphous oxide matrix, and the ceramic particles are cordierite particles and / or amorphous silica particles. And wherein the amorphous oxide matrix is formed of a colloidal oxide. delete The method of claim 1, Ceramic honeycomb filter, characterized in that the ceramic particles are made of pulverized powder of the same material as the ceramic honeycomb fired body. The method according to claim 1 or 3, The ceramic honeycomb filter, characterized in that the colloidal oxide is colloidal silica and / or colloidal alumina. A method of manufacturing a ceramic honeycomb filter having a ceramic honeycomb fired body having a porous partition partitioning a flow path and a sealing portion formed in a predetermined flow path, and removing particulates from exhaust gas passing through the porous partition wall. The ceramic honeycomb fired body is formed of a ceramic material mainly containing cordierite, And a sealing material fixed to the ceramic honeycomb fired body is formed by heating a sealing material filled in a predetermined flow path of the ceramic honeycomb fired body at a temperature of 1000 ° C or lower. The method of claim 5, The fixing temperature of the said sealing material is 500 degrees C or less, The method characterized by the above-mentioned. The method according to claim 5 or 6, At least a portion of the seal portion is formed by a sealant containing ceramic particles and a colloidal oxide. The method of claim 7, wherein And wherein the ceramic particles are made of pulverized powder of the same material as the ceramic honeycomb fired body. delete

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